I started out with a Nikon D100, and grew to a Nikon D300 in those 5 years. The Nikon D200 was in my possession only about 6 months or so. Man, the noise on that body was humongous.
The Lightroom library shows me that I started (semi-serious) with photography about 5 years ago. 2005 was a bit of a slow year though.
It seems that the number of photo's I make grows exponentially.
At this rate, my Drobo wil run out of space in about a month or so :)